Essays about: "Robin Törnkvist"

Found 2 essays containing the words Robin Törnkvist.

  1. 1. Vorticity and Gravitational Wave Perturbations on Cosmological Backgrounds Using the 1+1+2 Covariant Split of Spacetime

    University essay from Umeå universitet/Institutionen för fysik

    Author : Robin Törnkvist; [2018]
    Keywords : ;

    Abstract : In this thesis we consider perturbations of a perfect fluid on locally rotationally symmetrical (LRS) class II cosmological backgrounds, with a nonvanishing vorticity of the fluid on the perturbed model. The method used is based on the 1+1+2 covariant decomposition of spacetime, motivated by the assumption of anisotropic expansion, followed by a harmonic decomposition of all gauge invariant quantities. READ MORE

  3. 2. Tychonoff's theorem and its equivalence with the axiom of choice

    University essay from Umeå universitet/Institutionen för matematik och matematisk statistik

    Author : Robin Törnkvist; [2015]
    Keywords : Axoim of Choice; Compact set; Product space; Tychonoff s Theorem;

    Abstract : In this essay we give an elementary introduction to topology so that we can prove Tychonoff’s theorem, and also its equivalence with the axiom of choice. ... READ MORE